Theoretical study of a W-band-covering frequency tunable gyrotron

Fanhong Li, Chao-hai Du, Zi-chao Gao, Shi Pan, Liang Zhang, Pu-kun Liu, K. Ronald, Adrian W. Cross

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Abstract

The gyrotron has already demonstrated the capability of generating high-power coherent electromagnetic (EM) radiation at high frequencies and finds application in fusion plasma heating and magnetic resonance spectroscopy. In this article, we propose a W-band gyrotron, which uses a so-called multimode switching scheme to realize ultrabroadband frequency tuning capability, nearly covering about 70% of the W-band (75-110 GHz) range. The tuning strategy used to suppress mode competition and stabilize gun parameters in such an open-cavity multimode switching gyrotron is presented. Theoretical study shows that the multimode switching gyrotron can generate a frequency tuning range much wider than a conventional step-tuning gyrotron or a single-mode tuning gyrotron. In addition, another technology that uses a slot-assisted circuit to select only axis-symmetrical TE operating modes is presented. Using such a circuit, a tuning range of about 25 GHz in the W-band is obtainable. The proposed multimode switching gyrotron is a promising ultrabroadband source for millimeter-wave and terahertz-wave applications.

Original languageEnglish
Article number8945210
Pages (from-to)659-666
Number of pages8
JournalIEEE Transactions on Electron Devices
Volume67
Issue number2
Early online date30 Dec 2019
DOIs
Publication statusPublished - 29 Feb 2020

Keywords

  • frequency tunable gyrotron
  • W-band
  • coherent electromagnetic (EM) radiation
  • broadband tuning

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